Activating basal-plane catalytic activity of two-dimensional MoS2 monolayer with remote hydrogen plasma

Abstract
Two-dimensional layered transition metal dichalcogenide (TMD) materials such as Molybdenum disufide (MoS2) have been recognized as one of the low-cost and efficient electrocatalysts for hydrogen evolution reaction (HER). The crystal edges that account for a small percentage of the surface area, rather than the basal planes, of MoS2 monolayer have been confirmed as their active catalytic sites. As a result, extensive efforts have been developing in activating the basal planes of MoS2 for enhancing their HER activity. Here, we report a simple and efficient approach-using a remote hydrogen-plasma process-to creating S-vacancies on the basal plane of monolayer crystalline MoS2; this process can generate high density of S-vacancies while mainly maintaining the morphology and structure of MoS2 monolayer. The density of S-vacancies (defects) on MoS2 monolayers resulted from the remote hydrogen-plasma process can be tuned and play a critical role in HER, as evidenced in the results of our spectroscopic and electrical measurements. The H2-plasma treated MoS2 also provides an excellent platform for systematic and fundamental study of defect-property relationships in TMDs, which provides insights for future applications including electrical, optical and magnetic devices. © 2016 Elsevier Ltd.

Citation
Cheng C-C, Lu A-Y, Tseng C-C, Yang X, Hedhili MN, et al. (2016) Activating basal-plane catalytic activity of two-dimensional MoS2 monolayer with remote hydrogen plasma. Nano Energy 30: 846–852. Available: http://dx.doi.org/10.1016/j.nanoen.2016.09.010.

Publisher
Elsevier BV

Journal
Nano Energy

DOI
10.1016/j.nanoen.2016.09.010

Additional Links
http://www.sciencedirect.com/science/article/pii/S2211285516303731

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